Well, in general, hello everyone! Not that I consider you all stupid, or I have a CHSV scale, but rather read a book than go to worthless trainings. You will learn to count interest so that you can check if you have been heated with discounts, you can solve all sorts of problems at interviews, and not only for courier vacancies. And, well, you will learn a couple of interesting facts from the world of mathematics, so, for horizons, because if you say a couple of smart words on the first date, they begin to think that you are smart and have a rich inner world